Lenin wrote this article for the Encyclopaedia
Dictionary published by the Granat Brothers, which was then the most popular
in Russia. In the preface for the pamphlet edition in 1918 Lenin gave the
date of writing as 1913, from memory. Actually, he began it in the spring of
1914 in Poronin, but had to interrupt it, being too busy with his work
guiding the Party and the newspaper Pravda. Lenin resumed his work
on the aritcle only in September that year, after he had moved to Berne, and
finished it in the first half of November.

The aritcle was published in 1915 in Volume 28 of the
Dictionary with Bibliography of Marxism appended to it; it
was signed V. Ilyin. For censorship reasons, the editors omitted
two chapters: Socialism and Tactics of the Class Struggle of
the Proletariat and made a number of changes in the text.

In 1918, the Priboi Publishers put out the article in
pamphlet form exactly as published in the Dictionary but without
the “Bibliography.”

The full text of the article according to the manuscript was
first published by the Lenin Institute of the C.P.S.U. Central Committee in
the collection of Lenin’s articles Marx, Engels, Marxism,
which appeared in 1925.

Note that this document has undergone special formating to ensure that
Lenin’s sidenotes fit on the page, marking as best as possible
where they were located in the original manuscript.